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Channel access processing method and channel access processing device

A technology of channel access and processing method, which is applied in the field of channel access processing method and device, and can solve the problems of unfavorable listening stations to quickly access channels, etc.

Active Publication Date: 2013-07-31
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In the prior art, when the station receives a wireless frame containing both ACK indication and duration, the station will update the NAV value according to the duration value of the wireless frame, and set the RID Timer value according to the ACK indication contained in the wireless frame, then According to the meaning of virtual carrier detection, as long as one of NAV and RID Timer is not 0, the channel is considered to be busy. When the roughly estimated value of RID Timer is greater than the accurately estimated value of NAV, the listening station will follow the RID Timer value. Channel access, instead of channel access according to the obtained accurate channel reservation time NAV value, this method is not conducive to the fast access channel of the observer station, such as Figure 4 as shown, Figure 4 Schematic diagram of delaying access to the channel for the listening station according to the settings of NAV and RID Timer

Method used

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  • Channel access processing method and channel access processing device
  • Channel access processing method and channel access processing device

Examples

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Embodiment 1

[0079] In the wireless communication system using the two virtual channel detection mechanisms of setting NAV (that is, the second delayed access variable) and setting RID Timer (the first delayed access variable), there are three stations, respectively STA-a, STA -b and STA-c.

[0080] STA-a sends a wireless frame to STA-b, and the ACK indication field in the physical frame header of the wireless frame indicates non-ACK, BlockACK or CTS. STA-b correctly receives the wireless frame, and judges that the destination address of the wireless frame is its own MAC address, then STA-b clears its own RID Timer to 0, and keeps its own NAV value unchanged.

[0081] STA-c is an observer station, the initial value of NAV of STA-c is V1, the initial value of RID Timer is T1, STA-c receives the wireless frame, and decodes the partial association identifier (partial AID, partial association identifier) ​​does not match its own, in order to save energy, STA-c discards the wireless frame; sin...

Embodiment 2

[0083] In the wireless communication system using the two virtual channel detection mechanisms of setting NAV and setting RID Timer, there are three stations, namely STA-a, STA-b and STA-c.

[0084] STA-a sends a wireless frame to STA-b, and the ACK indication field in the physical frame header of the wireless frame indicates non-ACK, BlockACK or CTS. STA-b correctly receives the wireless frame, and judges that the destination address of the wireless frame is its own MAC address, then STA-b clears its own RID Timer to 0, and keeps its own NAV value unchanged.

[0085] STA-c is an observer station, the initial value of NAV of STA-c is V1, and the initial value of RID Timer is T1. STA-c receives the wireless frame, but receives an error and does not obtain the correct duration value. At this time, STA- c does not update its own NAV, that is, the value of NAV remains unchanged at V1, and updates its own RID timer to the time required to transmit MAX_PPDU+ACK+2*SIFS according to t...

Embodiment 3

[0087] In the wireless communication system using the two virtual channel detection mechanisms of setting NAV and setting RID Timer, there are three stations, namely STA-a, STA-b and STA-c.

[0088]STA-a sends a wireless frame to STA-b, and the ACK indication field in the physical frame header of the wireless frame indicates non-ACK, BlockACK or CTS. STA-b correctly receives the wireless frame, and judges that the destination address of the wireless frame is its own MAC address, then STA-b clears its own RID Timer to 0, and keeps its own NAV value unchanged.

[0089] STA-c is the listening station, the initial value of NAV of STA-c is V1, the initial value of RID Timer is T1, STA-c receives the wireless frame, and correctly decodes the value of duration as V2, STA-c compares V2 with The size of V1, V3=MAX(V1, V2), that is, V3 is equal to the value of the larger of V1 and V2, then STA-c updates the value of NAV to V3. In addition, STA-c also sets its own RID timer to the time ...

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Abstract

The invention discloses a channel access processing method which comprises the steps that a wireless site determines a first delay access variable and / or a second delay access variable according to a received wireless frame, and determines the delay time of accessing to a channel according to the second delay access variable or according to the first delay access variable and the second delay access variable. The invention further discloses a channel access processing device. With the adoption of the method and the device, an auditing site can be accessed to the channel quickly.

Description

technical field [0001] The invention relates to the channel access technology of an observer station in the field of wireless communication, in particular to a processing method and device for channel access. Background technique [0002] In the current wireless local area network (WLAN, Wireless Local Area Networks), an access point (AP, Access Point) and multiple stations (STA, Station) associated with it form a basic service set (BSS, Basic Service Set). The central access point and stations within the network share the channel using a Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) mechanism. One of the big problems is the conflict caused by hidden sites. For example: two stations A and B are outside the communication coverage of each other and cannot hear each other, but they can communicate with another station C, then based on the CSMA / CA mechanism, A and B transmit to C at the same time conflicts arise when figure 1 shown. [0003] In order to solve ...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/0816H04W24/08H04W84/12
Inventor 杨丹邢卫民吕开颖孙波李楠
Owner ZTE CORP
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